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Morphology and mechanical properties of layered silicate reinforced natural and polyurethane rubber blends produced by latex compounding

Authors

  • S. Varghese,

    1. Rubber Research Institute of India, Kottayam, Kerala-686009, India
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  • K. G. Gatos,

    1. Institut für Verbundwerkstoffe GmbH (Institute for Composite Materials), Kaiserslautern University of Technology, P.O. Box 3049, D-67653 Kaiserslautern, Germany
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  • A. A. Apostolov,

    1. Laboratory on Polymers, University of Sofia, BG-1126, Sofia, Bulgaria
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  • J. Karger-Kocsis

    Corresponding author
    1. Institut für Verbundwerkstoffe GmbH (Institute for Composite Materials), Kaiserslautern University of Technology, P.O. Box 3049, D-67653 Kaiserslautern, Germany
    • Institut für Verbundwerkstoffe GmbH (Institute for Composite Materials), Kaiserslautern University of Technology, P.O. Box 3049, D-67653 Kaiserslautern, Germany
    Search for more papers by this author

Abstract

Natural rubber (NR), polyurethane rubber (PUR), and NR/PUR-based nanocomposites were produced from the related latices by adding a pristine synthetic layered silicate (LS; sodium fluorohectorite) in 10 parts per hundred parts rubber (phr). The dispersion of the LS latices in the composite was studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Further information on the rubber/LS interaction was received from Fourier transform infrared spectroscopy (FTIR) and dynamic mechanical thermal analysis (DMTA). Tensile and tear tests were used to characterize the performance of the rubber nanocomposites. It was found that LS is more compatible and thus better intercalated by PUR than by NR. Further, LS was preferably located in the PUR phase in the blends, which exhibited excellent mechanical properties despite the incompatibility between NR and PUR. Nano-reinforcement was best reflected in stiffness- and strength-related properties of the rubber composites. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 543–551, 2004

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